This is that hard to find UV Blacklight Reactive Invisible Ink for box marking, document marking, and other unique security applications. Only visible under black light. Ink is water proof and very difficult to remove. Best viewed in dark or shaded area. Opticz Blacklight Reactive Invisible Printing Inks are suitable for paper marking as well as non-pourous material marking.
Opticz Blacklight Invisible Blue Ink Industrial Metal UV Marker
DirectGlow Invisible UV Blacklight Reactive Ink Marker with
Invisible Fabric Marker Pen
Blacklight Reactive Invisible UV Ink Marker Pen Large 3 Section
Opticz UV Blacklight Reactive Large Tip Invisible Ink Marker Blue
Blacklight Ink
DirectGlow UV Blacklight Reactive Large Tip Invisible
DirectGlow Invisible UV Blacklight Reactive Ink Marker with
Opticz
Invisible Marker
Opticz UV Blacklight Reactive Large Tip Invisible Ink Marker, Blue
Opticz XL Blue Invisible UV Blacklight Reactive Large Tip Security
Invisible Ink